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This paper shows results of an observation of overtaking frequencies on roads with opposing traffic. This observation is a first step of research regarding potential safety effects of advanced driver assistance systems on overtaking on two lane rural roads. We determine overtaking frequencies as a function of flow rates on both directions, distinguishing different vehicle types. Observed overtaking frequencies are lower than overtaking demand, especially when the directional split becomes more equal. Therefore we recommend adding directional split to the equation to calculate overtaking frequency.
Geertje Hegeman (Mon,) studied this question.
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